FRES1I-WATEK ALQ.E OF THE LM T I- D STATES. 41 



ing note : " In bottom of shallow, slowly running streams, adhering to ground or 

 fallen lea\es, &e., gelatinous green." The specimens agree well with the descrip- 

 tion of the European form, except that 1 lia\c n< \< i -<-ni the joints globose or ellip- 

 tical, but alirui/x c} lindrical, as tliey are said to be omctimca in the typical speci- 

 mens. The color of the spores also is not " fuse ou>," but tliat probably depend* 

 upon their not being fully mature. 



Fig. 7, pi. 'J, represents the spore of this species with the neighboring hctero- 

 cyst, magnified !'>(} diameters. 



C. comatiim, W.M.I, (^,. n,>v.) 



('. tcrri-stri-, stratum ^elutinosutn Krugincum intonlutn 1>runneo tinctum, formans; trichomati- 

 l''i- flexuosi.s, iutriciitK haud spiralibus, wqualibuH; articulis breve cvliiiilniccis, diamctro 

 ttqualibus ad plus duplo lungioribuH, plerumque Hcjunctis, pallide Krugincis, obscure granu- 

 latis ; ccllulis tcrminalibus hubglobosis ; gporis oblongo-cylindricis, diaroetro fere duplo longi- 

 oribus, granulatis, lutco-drumici* ; niembruna crassa, distinctc granulata. 



iHum.- -Spor. trans?. -nl n " .00048". Long. , AW -00092". Artie. .0001". 

 Jlab. In terra uda; Niagara, Canada. 



Growing on the ground, forming a gelatinous stratum of an aeraginous color, sometimes tinged 

 on edges with brown ; filaments flexuous, equal, intricate, not spiral; joints shortly cylin- 

 drical, equal to or more than twice as long as the diameter, mostly separated, pale eruginons, 

 obscurely granulato, terminal cells eubglobose ; spores oblong-cylindrical, about twice as 

 long as broad, granulate, yellowish-brown ; membrane thick, distinctly granulate. 



litn-k*. I found this Cylindrospermum growing upon the ground in the 

 marshes which border the Niagara River just above the Canadian Falls. It formed 

 a bright. Ktuginotis, gelatinous, but firmish, almost membranous, stratum. 



The filaments arc often quite long, and arc composed of short, cylindrical cells, 

 mostly placed rather far apart. The terminal cells are remarkable for being abun- 

 dantly provided with long, flexible, hair-like processes, upon the ends of which arc 

 minute lobular bodies (cells?). These appendages are so minute as to make it diffi- 

 cult to determine their structure, and although I have studied them with a 2 ' 5 th 

 immersion lens, giving a power of nearly 2500 diameters, there are some points 

 about them still undetermined. I do not know whether they or the little globules 

 are hollow or not. I do feel pretty certain, however, that the little globules are 

 distinct bodies, and that they finally drop off, leaving the naked hair behind. Is 

 it possible that they have any sexual significance I The spore-wall is thick, and 

 under a high power is seen to be distinctly granulate. The granules are of course 

 small, but in the perfected spore can plainly be seen with an eighth objective pro- 

 jecting out from the margin. 



Fig. 8, pi. 2, represents the spore-end of a filament, magnified 1375 diameters. 



Genus DOLICHOSPERMUM, THWAITES. 



Sporir elliptic, oblonpir vcl crlindraccR, inter cellnlaa vegctativas orttc, saepe in seriebus con- 

 nexa>, a cellnlis perdurantibns disjuncte. 



Spores elliptical, oblong, or cylindrical, occurring amidst the vegeUti?e cells, often connected in 

 eries, separated from the hcterocysts, 



6 April. 1878. 



